Airlock Feeder

An Airlock Feeder(also commonly referred to as a Rotary Airlock Valve,Rotary Feeder,Star Discharger,or Rotary Discharge Valve)is a precision-engineered industrial device that performs the dual critical functions of metering bulk solid materials and maintaining an air pressure seal between two connected pieces of equipment.It is the cornerstone component in pneumatic conveying,dust collection,and bulk material handling systems.

Core Working Principle

The airlock feeder operates on a simple yet highly effective rotary vane mechanism:

Material Inlet:Dry,free-flowing materials(powders,granules,flakes)enter from a silo,hopper,or cyclone,filling the pockets formed by the rotor's radial blades.

Rotary Transfer:Powered by a motor and gear reducer,the rotor turns slowly and steadily.The enclosed pockets capture and transport the material through the valve's cylindrical housing.

Controlled Discharge:As the rotor reaches the bottom outlet,gravity discharges the material.The continuous rotation ensures a smooth,consistent,and pulse-free flow rate.

Pressure Sealing:The tight,precision-machined clearance between the rotor blades and housing creates a near-perfect air lock.This isolates pressure differences(positive or vacuum)between the upper and lower sections,preventing air loss,backflow,or pressure drops that would disrupt system efficiency.

Key Design Features&Advantages

Superior Airtight Performance:Minimizes air leakage,maximizing energy efficiency in pressure/vacuum systems and preventing dust emissions.

Precise Volumetric Feeding:Delivers a consistent material flow rate,easily adjustable via a variable-frequency drive(VFD)controlling rotor speed.

Robust&Durable Construction:Available in carbon steel,304/316 stainless steel(for food/pharma/corrosive materials),or wear-resistant alloys for abrasive materials like cement or fly ash.

Compact&Versatile:Space-saving design with multiple flange options(square/round,drop-thru/side entry)for easy integration.

Low Maintenance:Designed for easy access,cleaning,and replacement of wear parts like blades and seals.

Safety&Compliance:Special designs available for high-temperature environments and explosion isolation(meeting NFPA standards).